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Orthogonal multiblade coordinates

Journal of Aircraft, 1981
Introduction T method of multiblade coordinates introduced by Coleman is a powerful technique for describing the motion of a multibladed helicopter rotor. Multiblade coordinates describe the overall rotor motion in a nonrotating coordinate frame fixed in the helicopter body.
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Orthogonal Curvilinear Coordinate Systems

2020
Orthogonal curvilinear coordinates occupy a special place among general coordinate systems, due to their special properties. There exists a number of such coordinate systems where the Laplace or Helmholtz equations may be separable, thus yielding a powerful tool to solve them.
Cossali G., Tonini S.
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Orthogonal Curvilinear Coordinates

The Mathematical Gazette, 1966
Although the gradient of a scalar, and the curl and divergence of a vector can be obtained by various elementary methods in terms of curvilinear components and coordinate vectors, the corresponding results for the components of strain and the vector divergence of stress are usually obtained by specializing the formulae for covariant derivatives.
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THE COORDINATE ORTHOGONALITY CHECK (CORTHOG)

Mechanical Systems and Signal Processing, 1998
Abstract A new technique referred to as the coordinate orthogonality check (CORTHOG) helps to identify how each physical degree of freedom contributes to the overall orthogonality relationship between analytical and experimental modal vectors on a mass-weighted basis.
P. Avitabile, F. Pechinsky
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Triply orthogonal coordinate systems

Bulletin géodésique, 1966
The properties of conformal transformations developed in the previous paper (Hotine 1965) are used to construct triply orthogonal coordinate systems from a scalar N. Classical doctrine on the subject requires that N should satisfy a third-order partial differential equation known as the Darboux equation, whereas no such restriction seems necessary in ...
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